This document contains summaries of three review sections:
1) The first section reviews elements, properties of alkali metals and halogens, statements about the periodic table, and properties of nonmetals.
2) The second section reviews that the properties of compounds depend on the elements and ratios that make them up, chemical formulas represent elements and ratios in compounds, and compounds can have different properties than their elements.
3) The third section reviews definitions of elements, compounds, and mixtures, including that elements are made of one type of atom, compounds two or more bonded elements, and mixtures are not chemically combined.
Unit 2, Lesson 2.6 - Elements and Compoundsjudan1970
Unit 2, Lesson 2.6 - Elements and Compounds
Lesson Outline:
1. Matter: An Overview
2. Pure Substance
3. Element vs. Compound
4. Metals, Metalloids, Nonmetals
5. Law of Definite Composition
We used this presentation after students investigated what happened when mixing vinegar and baking soda. Students researched what happened and reported to the class. This was a follow-up to clarify a few points.
Unit 2, Lesson 2.6 - Elements and Compoundsjudan1970
Unit 2, Lesson 2.6 - Elements and Compounds
Lesson Outline:
1. Matter: An Overview
2. Pure Substance
3. Element vs. Compound
4. Metals, Metalloids, Nonmetals
5. Law of Definite Composition
We used this presentation after students investigated what happened when mixing vinegar and baking soda. Students researched what happened and reported to the class. This was a follow-up to clarify a few points.
Earth Science Worksheet Chapter 21. Which of the following is .docxelishaoatway
Earth Science Worksheet Chapter 2
1. Which of the following is a mineral as defined by a geologist?
a) Boulder
b) Concrete
c) Sugar
d) Salt
e) Water
2. Why are boulders not a mineral?
a) They are not naturally occurring
b) They are organic
c) They are not solid
d) They do not have an orderly crystalline structure
e) They do not have a well-defined chemical
composition
3. What determines the physical and chemical properties of an atom?
a)The type of bonds
b)The number of electrons
c)The number of protons
d)The number of neutrons
e)The isotopic ratio
4. One significant difference between an ionic bond, where electrons are taken from
one atom and added to another atom and a covalent or metallic bond where electrons
are shared is ___________.
a)
ionic bonds are stronger than covalent or metallic bonds
b)
Ionic bonds produce ions but covalent and metallic bonds do not produce ions
c)
Ionic bonds make a material more malleable than covalent and metallic bonds
d)
Ionic bonds do not result in the attraction of oppositely charged atoms but covalent and metallic bonds do
5. What is the most abundant element found near the surface of Earth?
a)
Potassium
b)
Silicon
c)
Calcium
d)
Oxygen
e)
Hydrogen
6. What do the minerals gold, sulfur, and copper have in common?
a) Covalent bonds
b) They have the same density and hardness
c) They are each composed of a single element
d) They all transmit electricity easily because of their bonds
7. The silicon-oxygen tetrahedran, the most fundamental basis for forming minerals, contains:
a) Four oxygen atoms and one silicon atom
b) Four silicon atoms and one oxygen atom
c) Three silicon atoms and one oxygen atom
d) One silicon atom, one oxygen atom, one iron atom, and one magnesium atom
8. Which group does feldspar, one of the most common minerals near the surface of Earth,
belong to?
a) Carbonates
b) Oxides
c) Silicates
d) Evaporates
e) Sulfides
9. The definition of an ore deposit depends greatly on ___________ and ___________.
a) The presence of metallic bonds and concentration of the mineral
b) The presence of metallic bonds and the economics of recovering the mineral
c) The concentration of the mineral and the location of the deposit
d) The economics of recovering the mineral and the concentration of the deposit
10. The strong tendency of certain minerals to break along smooth,
parallel planes is known as_________.
a)
crystal form
b)
cracking luster
c)
streak
d)
cleavage
11. An atom’s mass number is 13 and its atomic number is 6. How many neutrons are in
its nucleus?
a)
7
b)
6
c)
13
d)
19
12. The ion at the center of a silicon-oxygen tetrahedron is surrounded by_____.
a) four sodium atoms
b) four oxygen atoms
c) six oxygen atoms
d) six sodium ions
13. Atoms of the same element, zinc for example, have the same number of ________.
a) neutrons in the outer nuclear shell
b) protons in the nucleus
c) electrons in the valence bond level
d) electrons in the nucleus
14. Wh.
1. Review Section 1.3
1)An element that is a very reactive gas is most likely a member of the
a) noble gases b) alkali metals c) halogens d) actinides
2)Which statement is true?
a)alkali metals should be stored under water b)alkali metals are group 2 elements
c)alkali metals react with elements of group 18 d) alkali metals are very reactive
3)Which statement about the periodic table is false?
a)there are more metals than nonmetals b)the metalloids are located between
metals and nonmetals c)the elements at the far left f the P.T. are nonmetals
d)elements are arranged by increasing atomic number
4)A property of nonmetals is that they are
a)shiny b)poor conductors c)are malleable and ductile
d)all are solids at room temperature
5)Which is not found on the periodic table
a) the atomic number of an element b) the symbol of an element
c) the atomic mass of an element d) the density of an element
6) When a sulfur atom gains two electrons, it becomes
a) a cation b) a +2 ion c) a -2 ion d) a -6 ion
7)Al +3 (aluminum ion) is an atom that has
a)3 fewer electrons than protons b)3 fewer neutrons than electrons
c)3 more protons than electrons d)none of the above
8) Elements in group 17 generally for ions with _____ charge
a) +7 b) +1 c) -7 d) -1
Review Section 2.1
1.- The properties of compounds depend on:
a) the neutrons in the atoms
b) the elements that make them and how they are combined(ratio)
c) the number of atoms
d) the way chemical formulas are written
2.- What is a chemical formula?
a) symbols that represent the elements in a compound
b) subscripts that tell the number of each atom in a compound
c) symbols and subscripts that tell the type of bond between atoms
d) symbols and subscripts that tell the type and ratio of atoms in a compound
3.- The same elements can form :
a) different compounds with different properties
b) different compounds with the same properties
c) the same compound with different properties
d) none
4.- Compounds often have different properties from those of the
a) electrons that make up the compound
b) elements that make up the compound
c) protons that make up the compound
2. d) crystals that make up the compound
5.- Different compounds can be composed of
a) the same elements in different ratios b) the same elements in the same ratio
c) no more than two elements d) only one element
Review Elements, Compounds, Mixtures
1.- Type of matter made of only one type of atom is :
a) element b) compound c) mixture d) molecule
2.- Smallest unit of an element :
a) atom b) molecule c) mixture d) all
3.- Type of matter that cannot be broken down by ordinary chemical means
a) element b) compound c) mixture d) none
4.- Which of the following statements is false
a) A compound is a substance made of 2 or more elements bonded together
b) An element cannot be broken down by ordinary chemical means
c) A mixture cannot be separated by physical means
d) A compound can be separated by chemical reactions
5.- The following are forms of matter except:
a) elements b) compounds c) energy d) mixtures
6.- Which of the following is a compound?
a) alcohol b) salty water c) gold d) hydrogen
7.- The smallest unit of a compound is called
a) atom b) molecule c) ion d) none
8.- When 2 or more substances are mixed but not chemically combined they form a
a) compound b) element c) mixture d) none
9.- The following model represents an Element ,a mixture or a compound?
_____________ ______________